A word used to describe someone who is always confused and is useless at telling jokes and/or understanding jokes. Usually the kind of person you will see tying their shoelaces on an escalator, or farting in an elevator.
The word is usually pronounced with a french accent

Malvyn - Hey guys! Hurry! the metro's about to leave!
Nam - Wait! I forgot my left shoe!
Carlos - Nam is such a touriste!